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Google and other searche engines now are going to support a new feature that offers a means of reducing comment spam. A new "nofollow" attribute, when used, stops search engines like Google, MSN and Yahoo(These two search engines have already accepted to handle this attribute) from following the link into the final page.

Quite a few of the blog providers have signed up to implement this, which means it does not make any sense to comment spam.

More information on this is available in this Google Blog post.